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Imagine a paperweight that not only holds piles of paper in place, but perpetually blinks !
A solar cell, supercapacitor, and a new ultra low power 555 chip make it possible !
The heart of this novelty is the CSS555 timer integrated circuit. It is a micropower version of the venerable 555 and 7555 chips that the electronics world knows ...
The basic circuit used here is the standard 555 astable setup. At the start of an ongoing cycle, the timing capacitor CT starts charging up through resistors RA ...
The diagram shows how the voltage cycles at the output pin and the timing capacitor. After the initial energizing of the circuit, steady state operation is established and ...
The values of the components used in the original paperweight circuit are: RA = 10M RB = 47K CT = 0.22uF RL = 47 CS = 1.0F These ...
A Google search will reveal a host of suppliers of phenolic stripboard. The CSS555 Timer IC is available from Jameco . Be sure to find a supercapacitor of ...
Once the electronic components have been gathered, breadboard them together to make sure everything will work to your satisfaction. It is not a pleasant task to fix a ...
The solar cell to use should be the thin film on glass type because these have good voltage under indirect or ordinary room lighting - even fluorescent. They ...
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